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  3. Ch. Q00-QA0
  4. Section Q90-Q99
Section Q90-Q99

Chromosomal abnormalities, not elsewhere classified

Clinical Classification Guidelines

Excludes2

  • mitochondrial metabolic disorders (E88.4-)

Subordinate Categories

Down syndrome
Q90
Trisomy 18 and Trisomy 13
Q91
Other trisomies and partial trisomies of the autosomes, not elsewhere classified
Q92
Monosomies and deletions from the autosomes, not elsewhere classified
Q93
Balanced rearrangements and structural markers, not elsewhere classified
Q95
Turner's syndrome
Q96
Other sex chromosome abnormalities, female phenotype, not elsewhere classified
Q97
Other sex chromosome abnormalities, male phenotype, not elsewhere classified
Q98
Other chromosome abnormalities, not elsewhere classified
Q99
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Data updated for October 2025 release.

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